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But the cold front by itself probably won't provide enough instability to unleash severe thunderstorms in Tarrant County. Only a light band of rain showers was sweeping over Fort Worth in the early afternoon.

Storms were not developing because a stout cap of dry air was flowing above the moisture, said Steve Fano, meteorologist with the weather service in Fort Worth.

"I think Mayfest is in good shape for tonight," Fano said. "Anyone out there may catch a sprinkle or maybe even a brief thunderstorm. But if they look off to the east this afternoon, they may see some impressive thunderstorms."

He said heating east of Dallas may provide the extra spark to ignite severe weather.

Fano added, however, that computer models indicate that the front will stall late Friday and possibly swing back into Tarrant County on Saturday morning. The cap of dry air, meanwhile, may erode overnight.

"In order to tap into that really good moisture, we have to eliminate the cap," Fano said, "If we can, there's quite a bit of energy in the atmosphere.

"(The front) looks like it may back up, and if it does, then the thunderstorm chances will increase. And, actually, we've got a 40 percent chance for them tomorrow."